diff --git a/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeRule.java b/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeRule.java
index 44f51c4f64..1b50fb46a1 100755
--- a/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeRule.java
+++ b/sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeRule.java
@@ -100,7 +100,7 @@ public boolean isCut() {
         return cut;
     }
 
-    public void setCut(boolean cut) {
+    private void setCut(boolean cut) {
         this.cut = cut;
     }
 
@@ -108,10 +108,6 @@ public AtomicLong getPassCount() {
         return passCount;
     }
 
-    public void setPassCount(AtomicLong passCount) {
-        this.passCount = passCount;
-    }
-
     public int getTimeWindow() {
         return timeWindow;
     }
@@ -143,12 +139,6 @@ public boolean equals(Object o) {
         if (grade != that.grade) {
             return false;
         }
-        // if (cut != that.cut) { return false; }
-        //// AtomicLong dose not Override equals()
-        // if ((passCount == null && that.passCount != null)
-        // || (passCount.get() != that.passCount.get())) {
-        // return false;
-        // }
         return true;
     }
 
@@ -158,9 +148,6 @@ public int hashCode() {
         result = 31 * result + new Double(count).hashCode();
         result = 31 * result + timeWindow;
         result = 31 * result + grade;
-        // result = 31 * result + (cut ? 1 : 0);
-        // result = 31 * result + (passCount != null ? (int)passCount.get() :
-        // 0);
         return result;
     }
 
@@ -179,6 +166,7 @@ public boolean passCheck(Context context, DefaultNode node, int acquireCount, Ob
         if (grade == RuleConstant.DEGRADE_GRADE_RT) {
             double rt = clusterNode.avgRt();
             if (rt < this.count) {
+                passCount.set(0);
                 return true;
             }
 
@@ -189,11 +177,17 @@ public boolean passCheck(Context context, DefaultNode node, int acquireCount, Ob
         } else {
             double exception = clusterNode.exceptionQps();
             double success = clusterNode.successQps();
-            if (success == 0) {
+            long total = clusterNode.totalQps();
+            // if total qps less than RT_MAX_EXCEED_N, pass.
+            if (total < RT_MAX_EXCEED_N) {
                 return true;
             }
 
-            if (exception / success < count) {
+            if (success == 0) {
+                return exception < RT_MAX_EXCEED_N;
+            }
+
+            if (exception / (success + exception) < count) {
                 return true;
             }
         }
diff --git a/sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeTest.java b/sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeTest.java
index 968cb5c4f2..27400f1bd8 100755
--- a/sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeTest.java
+++ b/sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/block/degrade/DegradeTest.java
@@ -70,6 +70,8 @@ public void testExceptionRatioModeDegrade() throws Throwable {
         String key = "test_degrade_exception_ratio";
         ClusterNode cn = mock(ClusterNode.class);
         when(cn.exceptionQps()).thenReturn(2L);
+        // Indicates that there are QPS more than min threshold.
+        when(cn.totalQps()).thenReturn(12L);
         ClusterBuilderSlot.getClusterNodeMap().put(new StringResourceWrapper(key, EntryType.IN), cn);
 
         Context context = mock(Context.class);
@@ -77,12 +79,12 @@ public void testExceptionRatioModeDegrade() throws Throwable {
         when(node.getClusterNode()).thenReturn(cn);
 
         DegradeRule rule = new DegradeRule();
-        rule.setCount(0.5);
+        rule.setCount(0.15);
         rule.setResource(key);
         rule.setTimeWindow(5);
         rule.setGrade(RuleConstant.DEGRADE_GRADE_EXCEPTION);
 
-        when(cn.successQps()).thenReturn(4L);
+        when(cn.successQps()).thenReturn(8L);
 
         // Will fail.
         assertFalse(rule.passCheck(context, node, 1));
@@ -90,7 +92,7 @@ public void testExceptionRatioModeDegrade() throws Throwable {
         // Restore from the degrade timeout.
         TimeUnit.SECONDS.sleep(6);
 
-        when(cn.successQps()).thenReturn(7L);
+        when(cn.successQps()).thenReturn(20L);
         // Will pass.
         assertTrue(rule.passCheck(context, node, 1));
     }
diff --git a/sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/config/TransportConfig.java b/sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/config/TransportConfig.java
index 791db903f3..5f934a9808 100755
--- a/sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/config/TransportConfig.java
+++ b/sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/config/TransportConfig.java
@@ -42,6 +42,10 @@ public static String getConsoleServer() {
         return SentinelConfig.getConfig(CONSOLE_SERVER);
     }
 
+    public static int getRuntimePort() {
+        return runtimePort;
+    }
+
     /**
      * Get Server port of this HTTP server.
      *
diff --git a/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/command/SimpleHttpCommandCenter.java b/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/command/SimpleHttpCommandCenter.java
index 66c4bb854e..f073ccaf75 100755
--- a/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/command/SimpleHttpCommandCenter.java
+++ b/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/command/SimpleHttpCommandCenter.java
@@ -124,9 +124,7 @@ public void run() {
                     }
                 }
 
-                if (success) {
-                    tmpPort = port;
-                } else {
+                if (!success) {
                     tmpPort = PORT_UNINITIALIZED;
                 }
                 TransportConfig.setRuntimePort(tmpPort);
diff --git a/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/heartbeat/SimpleHttpHeartbeatSender.java b/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/heartbeat/SimpleHttpHeartbeatSender.java
index 4eff03c93b..1fce561233 100755
--- a/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/heartbeat/SimpleHttpHeartbeatSender.java
+++ b/sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/heartbeat/SimpleHttpHeartbeatSender.java
@@ -52,7 +52,7 @@ public class SimpleHttpHeartbeatSender implements HeartbeatSender {
     public SimpleHttpHeartbeatSender() {
         // Retrieve the list of default addresses.
         List<InetSocketAddress> newAddrs = getDefaultConsoleIps();
-        RecordLog.info("Default console address list retrieved: " + newAddrs);
+        RecordLog.info("[SimpleHttpHeartbeatSender] Default console address list retrieved: " + newAddrs);
         this.addressList = newAddrs;
         // Set interval config.
         String interval = System.getProperty(TransportConfig.HEARTBEAT_INTERVAL_MS, String.valueOf(DEFAULT_INTERVAL));
@@ -61,6 +61,10 @@ public SimpleHttpHeartbeatSender() {
 
     @Override
     public boolean sendHeartbeat() throws Exception {
+        if (TransportConfig.getRuntimePort() <= 0) {
+            RecordLog.info("[SimpleHttpHeartbeatSender] Runtime port not initialized, won't send heartbeat");
+            return false;
+        }
         InetSocketAddress addr = getAvailableAddress();
         if (addr == null) {
             return false;